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Inheritance of photo-sensitivity in pigeonpea

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Saxena, K. B., Wallis, E.S., Chauhan, Y. S. and Byth, D.E. (2021) Inheritance of photo-sensitivity in pigeonpea. Indian Journal of Genetics, 81 (1). ISSN 0975-6906



Pigeonpea [Cajanus cajan (L.) Millsp.] is a short-day legume species and the late maturing genotypes are more photosensitive than early types. To generate information about the inheritance of photo-sensitivity, this study was conducted under natural and artificially extended (16 h) photo-periods using F1, F2 and BC1F1 generations. Under natural photo-period, F1 hybrids showed partial dominance of earliness; while in F2, a normal distribution that was skewed towards earliness was observed. In contrast under extended photo-period, the spread of F2 data was wide with discontinuities recorded at day 70, 82 and 103. Chisquare tests, when applied to F2 and BC1F1 data, suggested that three dominant genes (PS3, PS2 and PS1) controlled the expression of photo-sensitivity. These genes were found operating in a hierarchical order with PS2 and PS1 genes failing to express in the presence of PS3 gene. Similarly in the absence of PS3 gene, PS2 expressed but it masked the expression of PS1. Further, PS1 gene expressed only when both PS3 and PS2 were in recessive homozygous state. Hence, the proposed genetic model for photosensitivity in pigeonpea is PS3 > PS2 > PS1 and photoinsensitive genotype being a triple recessive (ps3ps3ps2 ps2ps1ps1).

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Open access
Keywords:Cajanus cajan, chi-square, photoinsensitivity, qualitative inheritance.
Subjects:Science > Botany > Genetics
Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate
Agriculture > Agriculture (General) > Methods and systems of culture. Cropping systems
Plant culture > Field crops
Plant culture > Field crops > Other field crops
Live Archive:22 Mar 2021 00:18
Last Modified:03 Sep 2021 16:46

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